Ilics, Katalin Biróné, Adrienn Baloghné Bakk, and Csilla Suskovics. 2013. “Researching the Aptitude of Young Volleyball Players (children and Adolescents)”. Journal of Human Sport and Exercise 8 (2proc):S61-S71. https://doi.org/10.4100/jhse.2012.8.Proc2.09.